Liquid crystal display and method for fabricating the same

Abstract

A liquid crystal display and a method for fabricating the liquid crystal display are provided. The liquid crystal display includes: a first substrate; scan lines arranged in a first direction on the first substrate; data lines arranged in a second direction such that the data lines cross the scan lines; pixel regions defined by the scan lines and the data lines; a thin film transistor region positioned on a cross region of the scan lines and the data lines such that the thin film transistor region is positioned over at least two of the pixel regions; pixel electrodes overlapped with at least a part of the thin film transistor region while being positioned on the pixel regions; a second substrate positioned apart from the first substrate and equipped with a common electrode, the second substrate opposing the first substrate; and a liquid crystal layer interposed between the first substrate and the second substrate.

What is claimed is: 
     
       1. A liquid crystal display comprising:
 a first substrate; 
 a plurality of scan lines arranged in a first direction on a surface of the first substrate; 
 a plurality of data lines arranged in a second direction such that the data lines cross the scan lines; 
 a plurality of pixel regions defined by the scan lines and the data lines; 
 a plurality of thin film transistor regions respectively positioned on cross regions of the scan lines and the data lines such that one thin film transistor region of the thin film transistor regions is positioned over at least two of the pixel regions, each of the thin film transistor regions comprising a semiconductor layer with four corners; 
 a plurality of pixel electrodes on the pixel regions, each of the pixel electrodes having at least four corners, at least one of the at least four corners of each of the pixel electrodes having a vertex and a tilted portion including the vertex, the tilted portion being tilted away from the surface of the first substrate and overlapping with one of the four corners of the semiconductor layer of a corresponding one of the thin film transistor regions; 
 a second substrate positioned apart from the first substrate and equipped with a common electrode, the second substrate opposing the first substrate; and 
 a liquid crystal layer interposed between the first substrate and the second substrate, 
 wherein each of the four corners of the semiconductor layer overlaps with one of the at least four corners of one of the pixel electrodes that is different from the pixel electrodes overlapping with other ones of the four corners of the semiconductor layer. 
 
     
     
       2. The liquid crystal display according to  claim 1 , wherein the liquid crystal layer comprises an optically compensated bend (OCB) mode liquid crystal layer. 
     
     
       3. The liquid crystal display according to  claim 1 , further comprising an alignment film interposed between the liquid crystal layer and the pixel electrodes, wherein the alignment film comprises a linear pre-tilt angle. 
     
     
       4. The liquid crystal display according to  claim 1 , wherein the thin film transistor region is positioned over at least four of the pixel regions. 
     
     
       5. The liquid crystal display according to  claim 1 , wherein the thin film transistor region is equipped with a patterned insulation layer. 
     
     
       6. The liquid crystal display according to  claim 5 , wherein the patterned insulation layer comprises a gate insulation layer. 
     
     
       7. The liquid crystal display according to  claim 1 , wherein the liquid crystal display further comprising a passivation layer interposed between a thin film transistor corresponding to the thin film transistor region and a region of the at least four corners of the pixel electrodes overlapping a part of the thin film transistor region. 
     
     
       8. The liquid crystal display according to  claim 7 , wherein the passivation layer comprises a patterned passivation layer. 
     
     
       9. The liquid crystal display according to  claim 1 , wherein a surface level difference between a portion of at least one of the pixel electrodes on an upper part of a thin film transistor corresponding to the thin film transistor region and another portion of the at least one of the pixel electrodes on a light emitting region of the first substrate is between about 0.2 μm and 1 μm. 
     
     
       10. A method for fabricating a liquid crystal display, the method comprising:
 forming a plurality of scan lines arranged in a first direction on a surface of a first substrate; 
 forming a plurality of data lines arranged in a second direction crossing the scan lines; 
 forming a plurality of thin film transistors connected to the scan lines and the data lines, each of the thin film transistors corresponding to a thin film transistor region, the thin film transistor region comprising a semiconductor layer with four corners; 
 forming a plurality of pixel regions defined by the scan lines and the data lines, one thin film transistor of the thin film transistors being positioned over at least two of the pixel regions and on a cross region of the scan lines and the data lines; 
 forming a plurality of pixel electrodes on the pixel regions, each of the plurality of pixel electrodes having at least four corners and at least one of the at least four corners of the pixel electrodes having a vertex and a tilted portion including the vertex, the tilted portion being tilted away from the surface of the first substrate and overlapped with one of the four corners of the semiconductor layer of a corresponding one of the thin film transistors, each of the plurality of pixel electrodes being connected with a corresponding one of the thin film transistors, wherein each of the four corners of the semiconductor layer overlaps with one of the at least four corners of one of the pixel electrodes that is different from the pixel electrodes overlapping with other ones of the four corners of the semiconductor layer; 
 forming a common electrode on a second substrate; 
 positioning the second substrate apart from the first substrate, the second substrate opposing the first substrate; and 
 injecting a liquid crystal layer between the first substrate and the second substrate. 
 
     
     
       11. The method for fabricating the liquid crystal display according to  claim 10 , wherein the liquid crystal layer comprises an optically compensated bend (OCB) liquid crystal. 
     
     
       12. The method for fabricating the liquid crystal display according to  claim 10 , further comprising rubbing first and second alignment films such that the first and second alignment films each comprises a pre-tilt angle, and forming the first alignment film on the pixel electrodes and the second alignment film on the common electrode before the injecting of the liquid crystal layer between the first substrate and the second substrate. 
     
     
       13. The method for fabricating the liquid crystal display according to  claim 10 , wherein the thin film transistor region is formed such that the thin film transistor region is positioned over at least four of the pixel regions. 
     
     
       14. The method for fabricating the liquid crystal display according to  claim 10 , further comprising patterning an insulation layer composing the thin film transistor on the thin film transistor region. 
     
     
       15. The method for fabricating the liquid crystal display according to  claim 14 , wherein the patterning of the insulation layer comprises patterning a gate insulation layer. 
     
     
       16. The method for fabricating the liquid crystal display according to  claim 10 , further comprising forming a passivation layer on the thin film transistor of the thin film transistor region, and forming the pixel electrodes on the passivation layer. 
     
     
       17. The method for fabricating the liquid crystal display according to  claim 16 , further comprising patterning the passivation layer. 
     
     
       18. The method for fabricating the liquid crystal display according to  claim 10 , wherein a surface level difference between a portion of at least one of the pixel electrodes on an upper part of the thin film transistor and another portion of the at least one of the pixel electrodes on a light emitting region of the first substrate is between about 0.2 μm and 1 μm.